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[schussel]

i was wondering how to generate any flux or have an outcome on the generation ... in many games for now i only managed to ever find marble (if at all) on few maps (mean whole worlds) the other flux stones are nowhere to find at all ... in many games i had to rely on marble when i did go for flux maps

does anyone know about the factors to generate it on worldgen or to improve the occurence of flux? or are there hidden layers that just dont show up on the embark screen?

[eugene]

Non marble flux is always sedimentary rock and there is no sedimentary rock in high volcanism regions. You could limit the range of volcanism to a low value, I think below 60. Then there will be no more volcanoes but more sedimentary rock.  You will have to set the number of volcanoes and minimum high volcanism squares to 0 or worldgen will only produce rejects.

[schussel]

ah ok that explains alot^^

[Double A]

Non marble flux is always sedimentary rock and there is no sedimentary rock in high volcanism regions. You could limit the range of volcanism to a low value, I think below 60. Then there will be no more volcanoes but more sedimentary rock.  You will have to set the number of volcanoes and minimum high volcanism squares to 0 or worldgen will only produce rejects.

So unless there are multiple biomes on your map, you can't get both 3/4 of the types of flux or obsidian? That sucks. Stupid reality.

But that means if you have obsidian at the top, you could still get a marble layer, right?

[eugene]

So unless there are multiple biomes on your map, you can't get both 3/4 of the types of flux or obsidian? That sucks. Stupid reality.

You can optimize the chances for a volcanic biome next to a sedimentary biome by setting the volcanism variances to a high number.

But that means if you have obsidian at the top, you could still get a marble layer, right?

Yeah, marble is a metamorphic rock and can appear below any other rock type. About that reality thing you are speaking, it just occurred to me that if marble is as in reality limestone metamorphosed by volcanic heat, where did the iron ore go. I mean limestone in DF is just full of iron ore, but there is no iron ore in marble. Probably marble in DF is from limestone layers where the dwarves extracted all the iron and afterwards accidently flooded the fortress with magma.

[Makbeth]

That's a good question, and it turns out that in reality magnetite is frequently found in volcanic and metamorphic regions.

As far as getting more flux, I just delete all the non-flux sed rocks from the raws and remove that silly ocean_deep tag from limestone.  Limestone can be found almost anywhere on Earth, not just on the ocean floor.  It frequently forms on the floor, sure, but the oceans change location a lot over geologic time.  Anywhere that's not covered by volcanic rocks is pretty likely to have limestone on Earth, and even in volcanic zones there's limestone underneath all the igneous layers. 

I think a big geology fix should be that we can find ancient sed layers buried several z layers down.  Especially considering there are world-spanning caverns down there.  Usually, when people think caverns, they think limestone.  Kind of a wall-banger to have 90% of DF caverns made in non-carbonate rocks, the only exception being when they happen to occur in marble.